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The BSV is in the core section of the engine. It is at the 6:00
position on the high pressure compressor case.
The fuel manifold goes from the fuel nozzle filter, down the left
side of the fan case to the fan support strut at the 6:00 position.
The manifold then goes along the high pressure compressor
case at the 6:00 position. The manifold attaches to the BSV. The
manifold that supplies the fuel nozzles around the combustion
chamber case, also attach to the BSV.
There are 20 fuel nozzles in the combustion case assembly.
ENGINE FUEL AND CONTROL - DISTRIBUTION - COMPONENT LOCATION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-005
ENGINE FUEL AND CONTROL - DISTRIBUTION - COMPONENT LOCATION
ENGINE FUEL AND CONTROL - DISTRIBUTION - COMPONENT LOCATION
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 73-11-00
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D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-005
ENGINE FUEL AND CONTROL - DISTRIBUTION - COMPONENT LOCATION
ENGINE FUEL AND CONTROL - DISTRIBUTION - COMPONENT LOCATION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-005
General
The fuel pump assembly supplies pressurized fuel for engine
operation. The fuel pump assembly has two types of
components. These components are fuel pumps and filters.
Fuel comes from the airplane fuel system and goes to the low
pressure fuel pump. After the low pressure fuel pump, fuel goes
out of the fuel pump assembly to the IDG oil cooler and the oil/
fuel heat exchanger. After the heat exchangers, the heated fuel
returns to the fuel pump assembly and goes to the fuel filter.
The fuel then goes to the high pressure fuel pump. After the
high pressure fuel pump fuel goes to the hydromechanical unit
(HMU) for engine combustion or goes through the wash filter
and servo fuel heater for use in the servo system.
Fuel Pumps
There is a low pressure fuel pump and a high pressure fuel
pump in the fuel pump assembly. The pumps increase fuel
pressure to send the fuel through the heat exchangers to
operate the servo systems and give fuel to the fuel nozzles.
The low pressure fuel pump is a centrifugal impeller pump. This
type of pump can operate at low fuel inlet pressure and with fuel
that is part liquid and part vapor. The low discharge pressure of
this pump lets the heat exchangers be lighter and more
efficient.
The high pressure pump is a single element, positive
displacement gear pump. This type of pump produces high
fuel pressures. This pressure is necessary to give a strong
combustor fuel spray pattern and to operate the engine
acuators that are part of the servo system.
The engine accessory gearbox (AGB) turns a drive shaft to
operate the fuel pump assembly. The fuel pump assembly
attaches to the aft side of the AGB. A quick attach detach (QAD)
ring attaches the pump to the AGB. The HMU attaches to the aft
end of the fuel pump assembly.
Fuel Filters
There are two fuel filters in the fuel pump assemblies, the fuel
filter and the servo wash filter.
The fuel filter has a line replaceable filter element. To remove
and replace the filter, first remove the drain plug to drain the
fuel from the filter housing. Next, remove the six bolts that hold
the filter cover and remove the filter cover and filter element. A
bypass valve is part of the filter assembly. If contamination
starts to clog the filter, a FILTER BYPASS light on the P5-2 fuel
control module comes on. If the filter fully clogs, the bypass
valve opens. When the bypass valve is open, fuel does not go
through the filter before it goes to the high pressure pump.
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL PUMP ASSEMBLY
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-006
See the fuel flow indicating section for more information on the
inlet fuel filter bypass light. (SECTION 73-30)
NOTE: Make sure you torque the six bolts on the filter cap per
the AMM when you replace the filter. If the bolts are
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